Re: [Qemu-devel] [PATCH v7] kvm: notify host when the guest is panicked

[Sasha Levin]

On 07/21/2012 09:12 AM, Wen Congyang wrote:
> +#define KVM_PV_PORT  (0x505UL)
> +
>  #ifdef __KERNEL__
>  #include <asm/processor.h>
>  
> @@ -221,6 +223,11 @@ static inline void kvm_disable_steal_time(void)
>  }
>  #endif
>  
> +static inline unsigned int kvm_arch_pv_features(void)
> +{
> +     return inl(KVM_PV_PORT);
> +}
> +

Why is this safe?

I'm not sure you can just pick any ioport you'd like and use it.